refactor(compiler): remove unused AstPath (#44411)

This code is no longer used now that ViewEngine has been removed.

PR Close #44411

packages/compiler/src/ast_path.ts

@@ -1,60 +0,0 @@
-/**
- * @license
- * Copyright Google LLC All Rights Reserved.
- *
- * Use of this source code is governed by an MIT-style license that can be
- * found in the LICENSE file at https://angular.io/license
- */
-
-/**
- * A path is an ordered set of elements. Typically a path is to  a
- * particular offset in a source file. The head of the list is the top
- * most node. The tail is the node that contains the offset directly.
- *
- * For example, the expression `a + b + c` might have an ast that looks
- * like:
- *     +
- *    / \
- *   a   +
- *      / \
- *     b   c
- *
- * The path to the node at offset 9 would be `['+' at 1-10, '+' at 7-10,
- * 'c' at 9-10]` and the path the node at offset 1 would be
- * `['+' at 1-10, 'a' at 1-2]`.
- */
-export class AstPath<T> {
-  constructor(private path: T[], public position: number = -1) {}
-
-  get empty(): boolean {
-    return !this.path || !this.path.length;
-  }
-  get head(): T|undefined {
-    return this.path[0];
-  }
-  get tail(): T|undefined {
-    return this.path[this.path.length - 1];
-  }
-
-  parentOf(node: T|undefined): T|undefined {
-    return node && this.path[this.path.indexOf(node) - 1];
-  }
-  childOf(node: T): T|undefined {
-    return this.path[this.path.indexOf(node) + 1];
-  }
-
-  first<N extends T>(ctor: {new(...args: any[]): N}): N|undefined {
-    for (let i = this.path.length - 1; i >= 0; i--) {
-      let item = this.path[i];
-      if (item instanceof ctor) return <N>item;
-    }
-  }
-
-  push(node: T) {
-    this.path.push(node);
-  }
-
-  pop(): T {
-    return this.path.pop()!;
-  }
-}

packages/compiler/src/compiler.ts

@@ -36,7 +36,6 @@ export {core};
 
 export * from './version';
 export {CompilerConfig, preserveWhitespacesDefault} from './config';
-export * from './ast_path';
 export {Identifiers} from './identifiers';
 export * from './resource_loader';
 export {ConstantPool} from './constant_pool';

packages/compiler/src/ml_parser/ast.ts

@@ -6,9 +6,9 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {AstPath} from '../ast_path';
 import {I18nMeta} from '../i18n/i18n_ast';
 import {ParseSourceSpan} from '../parse_util';
+
 import {InterpolatedAttributeToken, InterpolatedTextToken} from './tokens';
 
 interface BaseNode {
@@ -147,38 +147,3 @@ export class RecursiveVisitor implements Visitor {
     return Array.prototype.concat.apply([], results);
   }
 }
-
-export type HtmlAstPath = AstPath<Node>;
-
-function spanOf(ast: Node) {
-  const start = ast.sourceSpan.start.offset;
-  let end = ast.sourceSpan.end.offset;
-  if (ast instanceof Element) {
-    if (ast.endSourceSpan) {
-      end = ast.endSourceSpan.end.offset;
-    } else if (ast.children && ast.children.length) {
-      end = spanOf(ast.children[ast.children.length - 1]).end;
-    }
-  }
-  return {start, end};
-}
-
-export function findNode(nodes: Node[], position: number): HtmlAstPath {
-  const path: Node[] = [];
-
-  const visitor = new class extends RecursiveVisitor {
-    visit(ast: Node, context: any): any {
-      const span = spanOf(ast);
-      if (span.start <= position && position < span.end) {
-        path.push(ast);
-      } else {
-        // Returning a value here will result in the children being skipped.
-        return true;
-      }
-    }
-  };
-
-  visitAll(visitor, nodes);
-
-  return new AstPath<Node>(path, position);
-}